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Key points of chicken management in summer

2017-03-24 18:06 Source:

Key points of chicken management in summer

Since the beginning of summer, all kinds of problems have appeared in various farms, mainly including the decline of egg production rate, the decline of egg weight, the deterioration of egg color, and the decline of egg quality. In addition, due to the reduction of egg price, great losses have been brought to farmers and friends. In view of the above problems, simple communication on feed nutrition and management is carried out.
 
The energy requirement of laying hens can be estimated according to the formula: kJ / chicken · d = w (140-2t) + 2E + 5 △ W. W is the body weight (kg) of laying hens at that time, t is the average ambient temperature ℃, e is the average daily egg production (g); △ W is the average weight gain. The feed intake (g) of laying hens is equal to the actual energy required per day (MJ / chicken) × 1 000 / metabolizable energy (MJ / kg). At the appropriate temperature (13 ~ 23 ℃), with the decrease of temperature, the energy needed by the hens increases and the feed intake increases; otherwise, the feed intake decreases. In the high temperature environment, poultry first showed a decrease in food intake and an increase in drinking water. When the ambient temperature is higher than 23 ℃, the decrease of food intake caused by heat stress will greatly exceed the estimated value of the above formula: when the temperature increases from 23 ℃ to 34 ℃, the food intake decreases by 1 ~ 1.5 g / animal · D; at 32 ~ 36 ℃, when the temperature increases by 1 ℃, the food intake decreases by 4.2 g / animal · D. In addition, high temperature not only reduced feed intake, but also inhibited follicular development.
 
Therefore, we need to solve the problem of feed intake decline by various means. The specific operation methods are as follows:
 
1. The optimum temperature for laying hens to prevent heatstroke is 13 ℃~ 20 ℃. If the temperature is higher than 29 ℃, the egg production will decrease by 10% ~ 20%; when the temperature is 37.8 ℃, there is a risk of heatstroke. Therefore, heat prevention and cooling is the key to maintain high yield. (1) in the case of poor ventilation, direct cooling to the chicken house can be avoided.
 
(2) timely cleaning: chicken manure is easy to ferment to produce heat and emit harmful gases. The chicken house should be cleaned every morning and evening to keep the house clean and dry.
 
(3) ventilation: open all the windows and install fans in the chicken house if possible to improve the air convection and ensure the house is cool.
 
(4) reduce the density: the density is high, which is not conducive to heat dissipation. Generally, 7 chickens per square meter are suitable.

 
2. Adjust the diet: the feed intake of laying hens is reduced due to high temperature. Therefore, it is necessary to adjust the diet reasonably to better meet the nutritional needs of the hens in each stage of laying eggs. In the morning and evening, more protein content and lower energy diet should be fed, and at noon, more green and juicy feed should be fed, and the variety of feed should be diversified. In addition, it is necessary to increase the mineral composition in feed, especially calcium. Feed should be fed less frequently, and the feed trough should be kept clean to avoid affecting the appetite of chickens or causing gastrointestinal diseases. Change the feed formula and increase the nutrient concentration, The feed intake of laying hens in high temperature environment is reduced by 10% - 30%, and the feed utilization rate is also reduced. Therefore, the feed formula must be adjusted according to the feed intake to increase the nutrient concentration. 1% - 3% oil can be added to the feed to improve the energy level of the feed. It can also improve the palatability of the feed, increase the feed intake, reduce the speed of feed passing through the intestinal tract and improve the utilization rate of feed. If 0.1% ~ 0.15% methionine and 0.05% lysine were added, calcium could be increased to 4%, and the ratio of calcium to phosphorus was 7 ∶ 1. The main supplement of multivitamins was vitamin C, vitamin E and vitamin B, and the addition amount could be adjusted to 2 times of the normal amount.
 
3. Ensure drinking water. The average amount of drinking water for chickens is 150-250 ml, and the water temperature is about 10 ℃. Ensure that the water is not cut off all day, and keep the drinking water clean. At the same time, salt can be added to the drinking water to maintain the body's demand for inorganic salt. If the layer is cut off water for 24 hours, the egg production will decrease by 30%, and it will take 25 to 30 days to recover. If the water is cut off for more than 30 hours, the layer will molt. If feces increase, it is necessary to limit drinking water.
 
Fourth, strengthen epidemic prevention, summer is suitable for all kinds of pathogenic microorganisms and parasites reproduction, coupled with high temperature stress, leading to the body's resistance to disease weakened, is the common chicken disease season. Therefore, it is necessary to do a good job in epidemic prevention and isolation, timely vaccination of Newcastle disease, cholera, chicken plague and other vaccines, and regularly disinfect the chicken house to cut off the route of pathogen transmission. Disinfect every 7-10 days with antitoxic alkali and Lysol, once a day during the onset of the disease. To regularly add appropriate amount of antibiotics in feed, such as oxytetracycline, ciprofloxacin, norfloxacin, etc., can enhance the body's resistance to disease.
 
In terms of nutrition: 1. Increase the crude protein level of feed by 1-2 percentage points in peak period to 17-17.5%; at the same time, 0.5-1% oil and fat can be added to feed to improve the energy level of feed. 2. 0.2-0.3% sodium bicarbonate (chemical name: sodium bicarbonate, nahc03) was added to feed during peak period to regulate acid-base balance of body fluid and prevent respiratory acidosis. At the same time, it can also play a role in strengthening the stomach, which is conducive to the improvement of food intake. 3. 100-200g / T vitamin C was added to the feed during the peak period to improve the heat stress resistance of chickens. 4. It can add appropriate allicin to the feed during the peak period, which can not only strengthen the stomach and promote digestion, but also prevent the occurrence of intestinal and other diseases.
 
Finally, we also hope that you can add fermented feed in the early stage of breeding to promote intestinal health and intestinal absorption capacity of chickens, so as to achieve the tolerance of chickens to heat stress.



[editor in charge: Admin]
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